12-214. The man pulls the boy up to the tree limb C by
Chapter 12, Problem 12-214(choose chapter or problem)
12-214. The man pulls the boy up to the tree limb C by walking backward. If he starts from rest when .r4 = 0 and moves backward with a constant acceleration aA = 0.2 m/s2, determine the speed of the boy at the instant yH = 4 m. Neglect the size of the limb. When xA = 0. yB = 8 m, so that A and B are coincident, i.e.. the rope is 16 m long.
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